And earlier write manually changes (in my actuall working fabrik) made by you on your link on git hub on file components/com_fabrik/helpers/element.php.
I will actualize from GitHub when new version will arrive.

Now is OK, also for case:
if ($order1==0) {
$zam1 = "Razem wszystkie zam?wienia";
}

Rather than isset($order1) you should probably do "if ($order1 !== false)".

The filterValue() function now returns a value (if the filter is set) or 'false' if it isn't. And testing isset() on a false value will return true- it's set, to false, and only null / uninitialized counts as not isset().